Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa365b56df6b1ec…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 12:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7cd012de7e501e5f1b5e2878f5283aba SHA-1: e11d84b31c635b9b3f470e9bf61858f146958b58 SHA-256: 8aa365b56df6b1eca88ab3b7f836e69148195921f66e74a045ff45e193937ede
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=roms+mame4droid+0.37+b5 PDF link annotation
    • https://galerie-louise.be/userfiles/files/48593647483.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/gomixigedoxekaporobevid.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wilenir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b99a85d2---bonulavav.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/31328767859.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/xejumaweforuga.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tagogiwosilibip.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/14914238269.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/25195707482.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/jonazepoxovibedad.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/78881348820.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac09ce36ca---9138058006.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/50438922472.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/73387655655.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/tebuva.pdfIn PDF document text
    • https://blokhol.com/upload/files/69244512537.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/9560421761.pdfIn PDF document text
    • http://travellerisland.com/files/67551100775.pdfIn PDF document text
    • https://diphong.com/uploads/nenexasaka.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/xavudapenukisetedufidin.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/peguxe.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/9904402.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 17424 bytes
SHA-256: d716b0ae1d380089ac5a1d33187af76d1d7814a41bc0b9ed7c9e23583dde9178
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10968 bytes
SHA-256: ec6eff26937b97eb887c648bab51196200ed945f47845003ba5c98344f2c0e95

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